Number.EPSILON === Math.pow(2, -52)
// true
Number.EPSILON
// 2.220446049250313e-16
Number.EPSILON.toFixed(20)
// "0.00000000000000022204"
console.log(0.3===0.30000000);// true
console.log(0.3000000===0.3)// true
console.log((0.1+0.2)===0.3);// false
console.log(0.1+0.3===0.4)// true